aaa = [{'age': 18, 'name': '冯亚奇'}, {'age': 18, 'name': '李勇泽'},
       {'age': 21, 'name': '王晓丽'}, {'age': 21, 'name': '牛嘉恒'}, ]

b={}
for i in aaa:
    b[i['age']]=b.get(i['age'],[])+[i['name']]
print(b)


S='SQLALchemy in join left a perform to How?'
print('这是第10个',S[39::-1]+'?')



